Your digital music collection is crying out for new songs. Sure you could hit up the iTunes Music Store, or rip another CD, or fire up your P2P software and pray the RIAA doesn't eat your firstborn - but the plain ol' web is an untapped goldmine of audio. If you're willing to branch out beyond the Top 40, have a gander at six of my favorite places to find tunes on the web.

Google

Use Google operators to find unprotected directories of audio files or files of type .mp3. As suggested by this Google Tutor & Advisor article, a Google search like this:

Turns up several directory listings of Kleptones MP3's. Replace "Kleptones" with the artist, genre or keyword of your liking.

Singing Fish

If you don't want to screw around with nutty Google operators, check out Singing Fish, an exclusively audio and video search engine. See most popular searches and easily filter by file type and duration.

Webjay

Webjay is a playlist community. Webjay users create lists of songs that exist all over the Web in different formats. Browse around Webjay playlists and play them in a variety of music players - from Winamp to iTunes to RealPlayer. Not all formats are supported by all players, so it takes some patience to find what works with your software.

Webjay also has the "Play this page" bookmarklet which will generate a playlist from a list of music files on a web page. Snag that bookmarklet to help yourself sample songs from the sources mentioned here.

Also, The Hype Machine is an MP3 blog aggregator that gathers all the audio links on MP3 blogs into one place. (Thanks, Tim!)

Note: Some of these sources guarantee legal downloads (like Amazon). Others are aggregators and search engines that may or may not include links to pirated songs. Lifehacker doesn't condone piracy, but we sure do encourage readers to support musicians in their music-making endeavors. Lots of working musicians offer free downloads of their music to advertise. So go ahead and explore the "long tail," sample music from artists you never heard, and then head over to their web site and buy the album.

Where do you find new music on the web? Let us know in the comments or at tips at lifehacker.com.

Gina Trapani is the editor of Lifehacker. Her special feature Geek to Live appears every Wednesday and Friday on Lifehacker.